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  <title>舍去法取整</title>
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  <div id="layout-content"><div id="function.floor" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">floor</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">floor</span> &mdash; <span class="dc-title">舍去法取整</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.floor-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>floor</strong></span>
    ( <span class="methodparam"><span class="type">float</span> <code class="parameter">$value</code></span>
   ) : <span class="type">float</span></div>

  <p class="simpara">
   返回不大于
     <code class="parameter">value</code> 的最接近的整数，舍去小数部分取整。
  </p>
   </div>

   <div class="refsect1 parameters" id="refsect1-function.floor-parameters">
    <h3 class="title">参数</h3>
    <p class="para">
     <dl>

      
       <dt>
<code class="parameter">value</code></dt>

       <dd>

        <p class="para">
         要取整的数字
        </p>
       </dd>

      
     </dl>

    </p>
   </div>

   <div class="refsect1 returnvalues" id="refsect1-function.floor-returnvalues">
    <h3 class="title">返回值</h3>
    <p class="para">
     返回不大于
     <code class="parameter">value</code> 的最接近的整数，将
   <code class="parameter">value</code>
   的小数部分舍去取整。<span class="function"><strong>floor()</strong></span> 返回的类型仍然是
   <span class="type"><a href="language.types.float.html" class="type float">float</a></span>，因为 <span class="type"><a href="language.types.float.html" class="type float">float</a></span> 值的范围通常比 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 要大。
  </p>
   </div>

   <div class="refsect1 examples" id="refsect1-function.floor-examples">
    <h3 class="title">范例</h3>
    <p class="para">
     <div class="example" id="example-4127">
      <p><strong>Example #1 <span class="function"><strong>floor()</strong></span> 例子</strong></p>
      <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">floor</span><span style="color: #007700">(</span><span style="color: #0000BB">4.3</span><span style="color: #007700">);&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;4<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">floor</span><span style="color: #007700">(</span><span style="color: #0000BB">9.999</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;9<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">floor</span><span style="color: #007700">(-</span><span style="color: #0000BB">3.14</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;-4<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
   </div>

   <div class="refsect1 seealso" id="refsect1-function.floor-seealso">
    <h3 class="title">参见</h3>
    <p class="para">
     <ul class="simplelist">
      <li class="member"><span class="function"><a href="ceil.html" class="function" rel="rdfs-seeAlso">ceil()</a> - 进一法取整</span></li>
      <li class="member"><span class="function"><a href="round.html" class="function" rel="rdfs-seeAlso">round()</a> - 对浮点数进行四舍五入</span></li>
     </ul>
    </p>
   </div>

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